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About This Item

 

Full Description

This American National Standard specifies methods for measuring the sound pressure levels on a measurement surface enveloping a noise source (machinery or equipment) in an anechoic room or a hemi-anechoic room. The sound power level (or, in the case of impulsive or transient noise emission, the sound energy level) produced by the noise source, in frequency bands of width one-third octave or with frequency weighting A applied, is calculated using those measurements, including corrections to allow for any differences between the meteorological conditions at the time and place of the test and those corresponding to a reference characteristic acoustic impedance.
 

Document History

  1. ASA S12.55-2012 / ISO 3745:2012 (R2023)

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    American National Standard Acoustics - Determination of sound power levels of noise sources using sound pressure - Precision methods for anechoic and hemi-anechoic rooms

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  2. ASA S12.55-2006 / ISO 3745:2003


    Determination of Sound Power Levels of Noise Sources Using Sound Pressure - Precision Methods Anechoic and Hemi-Anechoic Rooms

    • Historical Version
 

Amendments, rulings, supplements, and errata

  1. ASA S12.55-2012/Amd.1-2021/ISO 3745:2012/Amd 1:2017


    Amendment 1 to American National Standard Acoustics - Determination of sound power levels of noise sources using sound pressure - Precision methods for anechoic and hemi-anechoic rooms